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19 November 2010, 10:33 | Updated: 19 November 2010, 11:10
The cost of widening the M25 has increased by nearly 25 per cent, or 660 million pounds.
The widening project covers 22 miles of the motorway, from junction 16 to junction 23 at the A1M interchange.
The National Audit Office says it's partly because the Highways Agency was too slow in testing an alternative to widening.
They were looking at the possibility of allowing drivers to use the hard shoulder at peak times.
The report says the delay in finalising the contract for widening the motorway meant it was signed at the height of the credit crunch.